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BIKELAND > FORUMS > ZX12R ZONE.com > Thread: No power over 8000rpm NEW TOPIC NEW POLL POST REPLY
frEEk


Administrator
ummm... yeah
Posts: 9650
posted August 16, 2014 08:52 AM        
No power over 8000rpm

For the longest time I thought my clutch was just starting to slip, but since it never actually lets go, now I'm thinking there's something wrong with power delivery. At the track this week I was able to see consistently that the engine was stuttering from about 8000rpm on. Almost feels like it is missing frequently or not getting enough fuel. Runs smooth and with seemingly full power up through about 7000rpm.

Anybody have the same symptoms?

Any winning method to definitively diagnose what is going on? (other than having to take the whole engine apart and inspect)

My guess would be I need to start by pulling the plugs and inspecting them.

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FlaminRoo


Novice Class
Posts: 75
posted August 16, 2014 12:43 PM        
battery dying ??
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frEEk


Administrator
ummm... yeah
Posts: 9650
posted August 16, 2014 03:19 PM        
don't think so. seems to start strong and li-ion means the voltage should always be strong. worth confirming though.
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bikerdude0_2


Parking Attendant
The Dude
Posts: 5
posted August 17, 2014 12:19 AM        
Most likely the fuel pump. When it starts to go, the pressure drops and the bike doesn't pull beyond 7/8k.
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shiphteey


Needs a job
Posts: 2516
posted August 18, 2014 11:43 PM        
Fuel pump
____________
Gemini Motorcycles

Topping out everything from Ninja 250s to nitrous ZX-14s.

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frEEk


Administrator
ummm... yeah
Posts: 9650
posted August 19, 2014 10:50 AM        
thx gentlemen. i'll check that first. may have to take to a dealer tho, looks like special tools required.
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tuusinii


Pro
Posts: 1016
posted August 19, 2014 08:28 PM        
I think the only tool you need is fuel pressure gauge and their cheaper to buy than to go to the dealer...
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zxWes


Parking Attendant
Posts: 3
posted August 19, 2014 11:40 PM        
Hi
autozone rents (free) a fuel pressure kit , gauge and t adapter plus other fittings .
tested my zx12r 2000 before regulator fuel pump on 44psi , pump stopped 42psi , max 72 psi when return blocked, volume 115 ml 3sec , but after regulator only 50ml 3sec run time .

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frEEk


Administrator
ummm... yeah
Posts: 9650
posted August 20, 2014 06:34 AM        
good tip. no autozone here but i'll check to see who has such a kit for rent.
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zxWes


Parking Attendant
Posts: 3
posted August 20, 2014 09:16 AM        
Hi
eBay you can get a similar fuel injection pressure kit for under 50$

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Zx12rus


Parking Attendant
Posts: 7
posted August 23, 2014 07:29 AM        
If u need a pump. I have a good used one for $50
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